Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
Posted: Wed Apr 29, 2009 6:10 am Post subject:
Yet Another VCO Subject description: 40106, two caps, 1 resistor, 1 Var resistor.
Control voltage serves as the supply voltage, and it starts oscillating at about 1.5 volts - which really works well with the output from my Lunetta's R/2R.
Linear? Expo? Bah - It is what it is - a simple VCO.
I don't recall where I saw this idea - but I breadboarded it, played with the values, and it works pretty well.
bruce
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Joined: Feb 28, 2008 Posts: 161 Location: chicago
Audio files: 9
Posted: Wed Apr 29, 2009 8:09 am Post subject:
perhaps it was the first post in the lunetta sound samples thread
i also posted this lonely thread over a year back
http://electro-music.com/forum/topic-24474.html
wow we sure have been lunetta-ing for quite some time now!
ill be making a post on more or less an identical vco on my blog thing later this week http://microhacking.blogspot.com/ i just want to make some new sound samples first... i have a few simple goofy extensions of the vco that you might think are fun
Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
Posted: Wed Apr 29, 2009 8:38 am Post subject:
Jeeese - those posts were a while ago lol - lots of CMOS has passed under the bridge since then.
I did some starving of chips early on (based on information in your post) and got some really interesting sounds - I posted one starvation experiment down the first page of the sounds thread.
In the first Lunetta I made I built starve pots built into the oscillators, and also had the ability to run a CV right into the power inputs - but I never got this same sort of result.
I think the second inverter 'buffer' makes it act much more like a tamed VCO compared to my early results with starvation... which were generally interesting but unpredictable.
Joined: Feb 28, 2008 Posts: 161 Location: chicago
Audio files: 9
Posted: Wed Apr 29, 2009 9:05 am Post subject:
RF wrote:
which were generally interesting but unpredictable.
yep! the unpredictably is what i enjoy most about these circuits
one thing ive tried has oscillators made out of most of the inverters on the chip and then using a CV as the supply voltage
it generates some super dense washes of sound
you (or someone else playing with this circuit) may want to add a switch that lifts the lug on the pot going to ground. this way you have the option to starve the current going to the chip. this usually works best when you make use of several inverters though
one thing ive tried has oscillators made out of most of the inverters on the chip and then using a CV as the supply voltage
it generates some super dense washes of sound
you (or someone else playing with this circuit) may want to add a switch that lifts the lug on the pot going to ground. this way you have the option to starve the current going to the chip. this usually works best when you make use of several inverters though
I'll keep the pot leg lifting in mind when I bread board my own test version of this YAVCO.
I'd mentioned on my BB after Bruce had posted the schematic yesterday, of setting up 3 x buffered 'oscillators' all controlled by the same tuning control. As long as the caps and resistors are as close to each other as possible, this could provide a wonderful thick sound over a hopefully decent tuning range.
It might be interesting to see/hear if there's any difference in starving via Vcc or Vss (Gnd). _________________ Revenge is a dish best served with a fork... to the eye
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